Assuming you live near Fort Worth, there is an amazing bakery on E. Lancaster, right down the street from Randy Adams Tattoo, and the Tattoo Bar. My son-in-law works at Randy Adams', and he and his wife, my daughter, have 4 kids, and those bakers have made some fantastic theme cakes for birthday parties, a Pirate's treasure chest that weighed about 10 lbs, one that looked like a Boba Fett helmet, another that was a beautiful princess castle, etc. The cakes are moist and delicious, though wearing an awful lot of frosting (which many people really like.) They go way beyond the applique-type topings, shapes, incredible add-ons, and I'll bet that a Porche would be no problem whatsoever.
The name of the place is Creme de la Creme, on E. Lancaster. I don't know the phone number, but you can probably Google the website, or call Information.